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From:   Ben Hutchings <ben@decadent.org.uk>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
CC:     akpm@linux-foundation.org,
        "Mauro Carvalho Chehab" <mchehab@s-opensource.com>,
        "Hans Verkuil" <hans.verkuil@cisco.com>,
        "Daniel Mentz" <danielmentz@google.com>
Date:   Wed, 28 Feb 2018 15:20:18 +0000
Message-ID: <lsq.1519831218.259950080@decadent.org.uk>
Subject: [PATCH 3.16 248/254] media: v4l2-compat-ioctl32: Copy 
 v4l2_window->global_alpha
In-Reply-To: <lsq.1519831217.271785318@decadent.org.uk>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

3.16.55-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Daniel Mentz <danielmentz@google.com>

commit 025a26fa14f8fd55d50ab284a30c016a5be953d0 upstream.

Commit b2787845fb91 ("V4L/DVB (5289): Add support for video output
overlays.") added the field global_alpha to struct v4l2_window but did
not update the compat layer accordingly. This change adds global_alpha
to struct v4l2_window32 and copies the value for global_alpha back and
forth.

Signed-off-by: Daniel Mentz <danielmentz@google.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -45,6 +45,7 @@ struct v4l2_window32 {
 	compat_caddr_t		clips; /* actually struct v4l2_clip32 * */
 	__u32			clipcount;
 	compat_caddr_t		bitmap;
+	__u8                    global_alpha;
 };
 
 static int get_v4l2_window32(struct v4l2_window *kp, struct v4l2_window32 __user *up)
@@ -53,7 +54,8 @@ static int get_v4l2_window32(struct v4l2
 	    copy_from_user(&kp->w, &up->w, sizeof(up->w)) ||
 	    get_user(kp->field, &up->field) ||
 	    get_user(kp->chromakey, &up->chromakey) ||
-	    get_user(kp->clipcount, &up->clipcount))
+	    get_user(kp->clipcount, &up->clipcount) ||
+	    get_user(kp->global_alpha, &up->global_alpha))
 		return -EFAULT;
 	if (kp->clipcount > 2048)
 		return -EINVAL;
@@ -86,7 +88,8 @@ static int put_v4l2_window32(struct v4l2
 	if (copy_to_user(&up->w, &kp->w, sizeof(kp->w)) ||
 	    put_user(kp->field, &up->field) ||
 	    put_user(kp->chromakey, &up->chromakey) ||
-	    put_user(kp->clipcount, &up->clipcount))
+	    put_user(kp->clipcount, &up->clipcount) ||
+	    put_user(kp->global_alpha, &up->global_alpha))
 		return -EFAULT;
 	return 0;
 }